* Matter is anything that takes up space and has mass.

* Space: Matter occupies a physical volume. You can't put two solid objects in the same space at the same time.

* Mass: Matter has inertia, meaning it resists changes in motion. The more massive something is, the harder it is to move.

Examples of objects with matter:

* Solids: Rocks, trees, your phone, a book

* Liquids: Water, juice, oil

* Gases: Air, oxygen, carbon dioxide

* Plasma: The sun, lightning, neon signs (a special state of matter)

Even things you can't see have matter:

* Air: While invisible, air is made of gases like nitrogen and oxygen, which have mass and take up space.

* Sound: Although sound travels as waves, it needs a medium (like air, water, or solids) to travel, and that medium is made of matter.

Things that don't have matter:

* Light: Light is made of photons, which are energy packets, not matter.

* Thoughts and emotions: These are mental processes and not physical objects.

Let me know if you'd like more details about any of these concepts!